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Exploring the unfolding pathways of protein families using Elastic Network Model
Ranjan Kumar1, Sandipan Dutta2
1Department of Physics, Birla Institute of Technology and Science, Pilani, Rajasthan, 333031, India.
Scientific Reports
|October 13, 2024
Summary
Protein unfolding pathways are dictated by native structure. Shear and soft modes reveal how proteins unfold, offering insights into thermal unfolding mechanisms and structural similarity.
Area of Science:
- Structural biology
- Computational biophysics
- Protein dynamics
Background:
- Protein structure dictates function.
- Understanding protein unfolding is crucial for biochemistry and medicine.
- Native structure influences unfolding pathways.
Purpose of the Study:
- To investigate the relationship between protein native structure and unfolding pathways.
- To analyze the role of local (shear) and global (soft modes) structural features during unfolding.
- To explore thermal and force-induced unfolding using simulations.
Main Methods:
- Gaussian Network Model (GNM) simulations with bond breaking.
- Analysis of local shear and global soft modes during unfolding.
- Examination of protein structural similarity using TM-score.
Main Results:
- Unfolding initiates in high-shear regions of the native structure and propagates to low-shear areas.
- Distinct unfolding pathways correlate with divergent soft mode behavior in proteins like Chymotrypsin inhibitor and Barnase.
- A strong correlation exists between native structure similarity (TM-score) and unfolding pathways.
Conclusions:
- Protein native structure is a key determinant of its unfolding process.
- Soft mode analysis can provide valuable insights into thermal unfolding pathways.
- Structural similarity is linked to conserved unfolding mechanisms.
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